package com.hmdp.utils;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * 用户登陆拦截器
 */
@Slf4j
public class RefreshTokenInterceptor implements HandlerInterceptor {
    //此类是自己创建的，不是有spring管理，不能通过注解注入，只能通过构造函数手动注入
    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            //不存在，直接放行
            return true;
        }
        //2.基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY+token);
        //3.判断用户是否存在
        if(userMap.isEmpty()){
            //4.不存在，直接放行
            return true;
        }
        //5. 将查询到的Hash数据转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        log.debug("用户存在，保存到ThreadLocal");
        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
